1 year ago

If you dissolve 10g of NaOH in a 250 mL aqueous solution, what is the pH?

Chemistry

1 answer:

Andreyy891 year ago

7 0

Convert 10g of NaOH to moles using the molar mass.

10 g NaOH / 39.997 g/mol NaOH = 0.25 mol NaOH

NaOH is a strong base so it dissolves completely in solution, so you’ll have 0.25 mol of OH-. Calculate the molarity of OH-.

0.25 mol OH / 0.250 L = 1.0 M OH-

Calculate the pOH. pOH = -log(1.0) = 0

pH = 14 - pOH = 14

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